# AD 90-25-17: Oil Cooler Inlet

- Type: Airworthiness directive
- Status: Current
- Products: SOCATA TB 10, TB 20, TB 21 and TB9
- Effective: January 3, 1991
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-6807
- Registered aircraft: 304 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7ED901C076BDBCEB86256A64006A05BE.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/90-25-17

## The airworthiness directive

90-25-17 SOCATA GROUPE AEROSPATIALE: Amendment 39-6807. Docket No. 90-CE-45-AD.

Applicability: Models TB9, TB10, TB20, and TB21 airplanes (all serial numbers), certificated in any category.

Compliance: Required within the next 25 hours time-in-service after the effective date of this AD, unless already accomplished.

To prevent possible uncontrolled release of flammable fluids into the engine compartment and engine malfunction because of loss of oil, accomplish the following:

  (a) Visually inspect the mounting bases of the oil cooler inlet and outlet elbows and the sponsons located near the outlet fittings for cracks or distortions.

  (1) If no cracks or distortions are found, return the airplane to service.

  (2) If cracks or distortions are found, prior to further flight remove the damaged cooler and install a new engine oil cooler as specified below in accordance with SOCATA Groupe AEROSPATIALE TB Aircraft Mandatory Service Bulletin No. 50/1, undated:Model Oil Cooler Part Number TB9-TB10 Z00.12258.64 TB20 Z00.12258.513 TB21 Z00.12258.518

  (b) Airplanes may be flown in accordance with FAR 21.197 and 21.199 to a location where the AD can be accomplished.

  (c) An alternate method of compliance or adjustment to the compliance time that provides an equivalent level of safety may be approved by the Manager, Brussels Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Office, c/o American Embassy, 15 Rue de la Loi, B-1040, Brussels, Belgium.

NOTE 1: The request should be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Brussels Aircraft Certification Staff.

NOTE 2: All persons affected by this directive may obtain copies of the document referred to herein upon request to SOCATA Groupe AEROSPATIALE, Socata Product Support, Aeroport Tarbes-Ossun-Lourdes, B P 930, 65009 Tarbes Cedex, France; Telephone 62.41.74.26; Facsimile62.41.74.32; or the Product Support Manager, U.S.; AEROSPATIALE, 2701 Forum Drive, Grand Prairie, Texas 75053; Telephone (214) 641-3614; Facsimile (214) 641-3527; or may examine these documents at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106.

This amendment (39-6807, AD 90-25-17) becomes effective on January 3, 1991.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A51EU](https://openairdocs.org/tcds/A51EU): Daher Aerospace; names 4 of 5 models: TB9, TB 21, TB 20, TB 10

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 304 (304 by airframe model, 0 by engine model)
- Makers: Socata 303, Socata Group Aerospatiale 1

Models with the most aircraft:

- [Socata TB-20 TRINIDAD](https://openairdocs.org/model/socata-tb-20-trinidad): 175 aircraft (airframe model)
- [Socata TB 10](https://openairdocs.org/model/socata-tb-10): 53 aircraft (airframe model)
- [Socata TB21](https://openairdocs.org/model/socata-tb21): 50 aircraft (airframe model)
- [Socata TB20](https://openairdocs.org/model/socata-tb20): 25 aircraft (airframe model)
- [Socata Group Aerospatiale TB9](https://openairdocs.org/model/socata-group-aerospatiale-tb9): 1 aircraft (airframe model)

All 5 models: https://openairdocs.org/ad/90-25-17/models.md
Every aircraft: https://openairdocs.org/ad/90-25-17/aircraft.md

Its text cites no advisory circulars or STCs.

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